ab = { 'Swaroop'    :   'swaroop@swaroopch.com',
       'Larry'      :   'larry@wall.org',
       'Matsumoto'  :   'matz@ruby-lang.org',
       'Spammer'    :   'spammer@hotmail.com'
       }

print("Swaroop's address is", ab['Swaroop'])

del ab['Spammer']

print('\nThere are {0} contacts in the address-book\n'.format(len(ab)))

for name, address in ab.items():
    print('Contact {0} at {1}'.format(name, address))

ab['Guido'] = 'guido@python.org'
if 'Guido' in ab:
    print("\nGuido's address is", ab['Guido'])